| Autor: |
Xia C; School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea., Hong WT; School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea., Kim YE; School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea., Choe WS; School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea., Kim DH; School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea., Kim JK; School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon 16419, Korea. |
| Abstrakt: |
In this study, a solution-processable compact vanadium oxide (V 2 O 5 ) film with a globular nanoparticulate structure is introduced to the hole transport layer (HTL) of polymer bulk-heterojunction based solar cells comprised of PTB7:PC 70 BM by using a facile metal-organic decomposition method to replace the conventionally utilized poly(3,4-ethylenedioxythiophene): poly(styrenesulfonate) (PEDOT:PSS). For this, a biocompatible structure-determining agent, polyethylene glycol (PEG, M n 300), is used as an additive in the precursor to form the nanoparticulate compact V 2 O 5 (hereafter referred to as NP-V 2 O 5 ) film, which possesses an outstandingly smooth surface morphology. The introduction of NP-V 2 O 5 HTL via the solution process with a neutral pH condition successfully improved the stability by preventing the decomposition of indium tin oxide (ITO) glass and the penetration of heavy-metal components and moisture, which are considered as the crucial drawbacks of using PEDOT:PSS. Over 1440 h (60 days) of the stability test, an organic solar cell (OSC) with NP-V 2 O 5 showed a significant durability, maintaining 82% of its initial power conversion efficiency (PCE), whereas an OSC with PEDOT:PSS maintained 51% of its initial PCE. Furthermore, due to the positive effects of the modified surface properties of NP-V 2 O 5 , the PCE was slightly enhanced from 7.47% to 7.89% with a significant improvement in the short-circuit current density and fill factor. |
